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Old Apr 9, 2020 | 03:59 PM
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What Is This?

I was starting on my tubs today and was confused when I saw this on the back side of my welds... any ideas?





 
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Old Apr 9, 2020 | 04:19 PM
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It looks like you are welding a seam that has been brazed or possibly welding galvanized material. The presence of brass or zinc will cause that white fuming that you have.
 
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Old Apr 9, 2020 | 05:12 PM
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x2 on the zink/galv., Those fumes are really bad, Put on a respirator for sure!! Just had same thing happen on a small piece I was repairing. little white fumes when burning in. Welds find but probably as healthy as the virus.
 
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Old Apr 9, 2020 | 06:59 PM
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X3 on that.

https://www.redsteelmh.com/avoid-gal...-when-welding/
 
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Old Apr 9, 2020 | 08:13 PM
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X4, ... with a story, if you had started on the other side you probably would have had bad ugly welds that wouldn't penetrate. How do I know this, I was just using the floor pan out of a Lincoln viii in a project car as seat and console mount and I could not get good welds with the white spots. Turned out the floor pan was galvanized coated and had to grind it off where I was welding. Pictures available upon request.


 
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Old Apr 9, 2020 | 09:32 PM
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Yikes.... I thought it could have been one of two things:
1.) Crazy spiders helping me, or
2.) Something potentially harmful. I vaguely remember someone talking about this on a thread years ago, which is why I immediately stopped and posted this question.

This is why this site is the best! Much appreciated.
 
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Old Apr 9, 2020 | 10:58 PM
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To be specific the white stuff is zinc oxide, inhaling vaporized zinc oxide can result in metal fume fever, symptoms are flu-like and usually pass within 24 hours. Best to wear a welding particulate respirator when welding galvanized, to be honest it's a good idea to wear a welding particulate respirator whenever you are welding.
 
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Old Apr 11, 2020 | 01:01 AM
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I also say galvanized (zinc) material, you can weld it but clean weld areas by sanding or light grinding first, weld in open area, open garage is ok, a fan works wonders and keep you head out of the weld smoke.
 
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Old Apr 11, 2020 | 05:34 AM
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Originally Posted by truckeemtnfords
I also say galvanized (zinc) material, you can weld it but clean weld areas by sanding or light grinding first, weld in open area, open garage is ok, a fan works wonders and keep you head out of the weld smoke.
Don't use a fan if you are mig welding. Blows the shielding gas away. Welds look like crap afterwards. Like others say, fresh air is important, that stuff is toxic big time.
 
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Old Apr 11, 2020 | 11:33 AM
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Tig also uses a shielding gas. But you use the fan to draw the fumes away not blow them away, that is what a welding fume extractor does, it draws the fumes away.
 
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